7ML19985CN01 Milltronics SF 500 – INSTRUCTION MANUAL Page 35
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Recalibration
Direct Zero
Use direct zero entry (P367) when replacing software or hardware, if it is not convenient
to perform an initial zero. A record of the last valid zero count is required.
Access P367 and enter EDIT mode
Press
Auto Zero
Use Auto Zero to perform a zero calibration automatically when flow stops.
The Auto Zero function provides automatic zero calibration in RUN mode if all of these
conditions are met:
• the auto zero input (terminals 29/30) is in a closed state; jumper or remote contact
• the rate of flow is between +2 and -2% of the design rate (P011)
• The terminal and rate status coincide for at least one calibration period (P360)
The rate display is interrupted by the Auto Zero routine
The duration of the auto zero is one or more calibration periods (P360). If either condition
is interrupted during those periods, the auto zero is aborted and the RUN display
resumes. There is no loss of totalization. After one calibration period, another auto zero is
attempted if the input and rate conditions are met.
If the resulting zero deviation is less than an accumulated 2% from the last operator
initiated zero, the auto zero is accepted.
If the deviation is greater than an accumulated 2%, an error message is displayed. The
error message is cleared after five seconds, however if a relay is programmed for
diagnostics, it remains in alarm so long as the Auto Zero conditions are being met.
If material feed resumes during an auto zero function, the zero is aborted and the
totalizing function restarts where it left off.
P367 Direct Zero Entry E
Enter Zero Count 0
Zero Calibration. Current Zero V
Enter Zero Count 551401
Rate 0.00 t/h
Total 1: 0.00 tonnes AZ
Calibration Complete. Deviation 0.0
Auto-Zero value 551410
e.g. the last valid zero count
(AZ flashes on and off)
e.g. typical zero and deviation values
enter the last valid zero count,
e.g. 551401
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